Blueprint

 A cyanotype is essentially a blueprint.

Mid 19th century: from the original process in which prints were composed of white lines on a blue ground or of blue lines on a white ground.

Wisconsin Historical Society Building Architectural Details | Drawing |  Wisconsin Historical SocietyMake Vintage Art From Your Home Blueprints - What Meegan Makes6,029 Vintage Blueprints Stock Photos, High-Res Pictures, and ...

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